Yanmar 1GM10, Shop Manual

Page: 119 / 240

MULTICYLINDER ENGINES 113
OIL PICKUP
AND
MODELS)
When installing the valve guides, the grooved end must
be toward the top of the cylinder head. The groove must
be flush with the head surface as shown in Figure 25.
PUSH RODS
1 . Remove the rocker arms as previously described.
2. Remove the push rods and mark them so they can be
reinstalled in their original positions.
3. Inspect the push rod ends for damage. Maximum al-
lowable
is 0.03 mm (0.0012 in.).
4. Reinstall the push rods by reversing the removal pro-
cedure. Adjust valve clearance as described in Chapter
Three.
ROD ASSEMBLY
Rod Removal
1. Remove the engine as described in this chapter.
2. Place a suitable container under the oil pan and remove
the drain plug. Let the crankcase oil drain, then reinstall
the drain plug.
3. Remove the cylinder head as described in this chapter.
4. Remove the oil pan.
5. On
and models-Loosen
the oil pickup jam nut (Figure 26) and remove the oil
pickup.
6. Rotate the crankshaft until the piston is at bottom dead
center. Pack the cylinder bore with clean shop rags. Re-
move the carbon ridge at the top of the cylinder bore with
a ridge reamer. These can be rented for use. Vacuum out
the shavings, then remove the shop rags.
7. Rotate the crankshaft until the connecting rod is cen-
tered in the bore. Measure the clearance between the con-
necting rod and the crankshaft journal flange with a flat
feeler gauge (Figure 27). If the clearance exceeds specifi-
cations (Tables
1-3), replace the connecting rod during re-
assembly.
8. Remove the connecting rod bolts. Lift off the cap, to-
gether with the lower bearing insert.
9. Use a wooden hammer handle to push the piston and
connecting rod
the bore.
10. Remove the piston rings with a ring remover (Figure
28).